Preheat the oven to 350°F. Line two baking sheets with parchment., In a large mixing bowl, cream together the butter, sugar, salt, vanilla, baking soda, and egg., Add the flour and mix until smooth. Stir in the sesame seeds., Drop the dough by tablespoonfuls (our tablespoon cookie scoop works well here) onto the baking sheets., Bake the wafers for 8 to 9 minutes, or until they're golden brown., Remove them from the oven, allow them to cool for 1 minute on the pan, then transfer the wafers to a wire rack to cool completely., Store in a closed container for up to a week. Freeze for up to a month.